How much can solar save on your electricity bill? Real examples
The number one question homeowners ask before going solar is simple: how much will my bill actually come down? The honest answer is that it depends on four things — how much electricity you consume, what you pay per unit, how much sunlight your roof gets, and what size system you install.
This guide gives you real numbers, real examples, and a simple way to estimate your own savings.
How solar reduces your electricity bill
When your solar panels are generating electricity and you are simultaneously consuming it, you use free solar power instead of paying for grid electricity. For every unit of solar power you consume directly, you save the retail tariff rate your DISCOM charges you.
When you generate more than you need at a given moment, the surplus goes to the grid and your net meter records an export credit. That credit offsets future grid consumption on your bill.
The combination of direct self-consumption and export credits is what brings your monthly bill down.
What determines your monthly savings?
Consumption level. A household consuming 600 units per month benefits more from a 3 kW system than one consuming 100 units, because the 600-unit household will use most of the solar output directly at the higher tariff rate.
Your tariff slab. Most Indian DISCOMs have tiered tariffs where higher consumption is charged at higher rates. If you are in a higher tariff slab, each solar unit is worth more to you.
System size relative to consumption. A 3 kW system generating 380 units per month makes almost no difference to a household consuming 80 units — they cannot use or benefit from most of the generation. The same system is transformative for a 400-unit household.
Roof orientation and shading. A south-facing unshaded roof delivers maximum generation. Partial shading or east-west orientation reduces output by 10 to 25 percent.
Real examples: what households actually see on their bill
Example 1: Jaipur family, 400 units per month consumption
Before solar: monthly bill approximately Rs 3,500 (upper tariff slab)
System installed: 3 kW, costing Rs 1.65 lakh before subsidy, Rs 87,000 after subsidy
Monthly generation: approximately 450 units
Direct consumption: approximately 300 units (nights and early mornings still draw from grid)
Export credits: approximately 150 units
Monthly bill after solar: approximately Rs 200 to Rs 400
Monthly saving: approximately Rs 3,100 to Rs 3,300
Payback period: approximately 27 to 28 months
Example 2: Bengaluru apartment, 250 units per month consumption
Before solar: monthly bill approximately Rs 1,800
System installed: 2 kW (terrace share in society)
Monthly generation: approximately 240 units
Monthly bill after solar: approximately Rs 300 to Rs 500
Monthly saving: approximately Rs 1,300 to Rs 1,500
Payback period: approximately 4 to 5 years
Example 3: Mumbai suburban home, 600 units per month
Before solar: monthly bill approximately Rs 6,000 (highest tariff slab)
System installed: 5 kW
Monthly generation: approximately 480 units
Monthly bill after solar: approximately Rs 1,000 to Rs 1,500
Monthly saving: approximately Rs 4,500 to Rs 5,000
Payback period: approximately 4 to 5 years after subsidy
A simple formula to estimate your savings
Your monthly solar savings equal the number of solar units you self-consume multiplied by your retail tariff per unit, plus export units multiplied by the export compensation rate.
A rough rule of thumb for grid-connected systems without battery: approximately 70 to 75 percent of solar generation is self-consumed and 25 to 30 percent is exported. This ratio improves if you shift daytime activities like washing, ironing, and cooking to solar hours.
What does not reduce with solar
Fixed charges. Your DISCOM’s fixed monthly charges or minimum bill amount continues regardless of solar generation. In some states this is Rs 100 to Rs 300 per month; in others it is higher. This is the floor your bill will not go below even with a well-sized solar system.
Night consumption. Solar generates nothing at night. Grid consumption at night is billed normally. Net metering offsets this through daytime export credits, but if you consume heavily at night, your bill reduction will be partially limited until those export credits are applied.
How to shift habits for maximum savings
The more of your electrical consumption you move to daytime hours — when solar is generating — the more you displace grid electricity directly and the higher your effective savings.
Running your washing machine, dishwasher, electric water heater, and ironing during 9am to 4pm maximises direct self-consumption. Using air conditioning during those hours is also financially optimal for solar households.
Summing up
For a household consuming 350 to 500 units per month in a reasonably sunny city, a 3 kW solar system after the PM Surya Ghar subsidy can reduce the electricity bill by 70 to 90 percent. The exact figure depends on your tariff, consumption pattern, and location. The savings are most dramatic in high-tariff states like Maharashtra and Karnataka for high-consumption households.